20160322, 19:17  #1772 
"Dave"
Sep 2005
UK
AD8_{16} Posts 
You wait around for ages for a prime ... and then 3 come along at once!
4063*2^23092631 (695162 digits) 4063*2^23101871 (695440 digits) 4063*2^23138431 (696540 digits) 
20160322, 19:33  #1773  
Dec 2011
After milion nines:)
3·11·43 Posts 
Quote:
Congratulations! And in average you wait about 10 days between primes, not ages :) 

20160325, 19:23  #1774 
"Dave"
Sep 2005
UK
101011011000_{2} Posts 
The reference was intended to be for k=4063 where the last prime was for n=738843, although in reality I was just stealing the saying about buses (at least in the UK).

20160325, 20:35  #1775 
Dec 2011
After milion nines:)
3×11×43 Posts 

20160409, 06:35  #1776 
"Carlos Pinho"
Oct 2011
Milton Keynes, UK
2^{3}·13·47 Posts 
143*2^20078881 is prime! (604437 decimal digits) Time : 1351.837 sec. from SMD.

20160414, 01:43  #1777 
"Curtis"
Feb 2005
Riverside, CA
4747_{10} Posts 
13*2^{3527315}1. 1061829 digits.
That's 3 over 3M for k=13, and 5 over 2M! 
20160414, 10:17  #1778 
Sep 2002
Database er0rr
19×191 Posts 

20160415, 06:47  #1779 
"NOT A TROLL"
Mar 2016
California
197 Posts 
:chicken: :rainbow: :fireworks: How do you do these things? How to find a prime like the one above except 52*3^n+/1, or some other k. b = 2 to 16 (the bases) Last fiddled with by PawnProver44 on 20160415 at 06:52 
20160415, 11:52  #1780  
Sep 2002
Database er0rr
3629_{10} Posts 
Quote:
If you are bent on finding a megaprime, start with testing those. (mods please feel free to detach this subthread) 

20160422, 12:53  #1781 
"Dave"
Sep 2005
UK
2^{3}×347 Posts 
4161*2^22403581 (674419 digits)

20160426, 11:29  #1782 
"Dave"
Sep 2005
UK
5330_{8} Posts 
4161*2^23268751 (700463 digits)

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